Mlmnemonist

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- With preprocess added to gridsearch
- merge_cfg added to ExperimentRunner

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- Grid search bug removal
- Implement two types of grid search: one using a palette config and another using a directory
containing all the config files
- Retrieve added to ExperimentRunnerFactory
- Updated naming scheme for experiments such that each experiment has a description file and
their name contains the date of today

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- Bug removal in validation tools

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- Add expand_cfg for hyperparameter tuning
- Add gridsearch for hyperparameter tuning
- Change cache token scheme

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- Bug removal in CACHE.RESET() where directories are included in the logs
- Runner pipeline cloning option added
- preprocess does keep the pipeline by default

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- Add reload_cfg before each call of runner.run
- Add reload_cfg before each call of runner.preprocess
- Add runner.export_logs() method to get a zip file from all
logfiles in the experiment directory